Home / 2,815.35-3,885.40-1,620.71

Finding the Fourth Proportional to 2,815.35, 3,885.40 and 1,620.71

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Solution

The fourth proportional to 2,815.35, 3,885.40 and 1,620.71 is: 2,236.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.35 : 3,885.40 = 1,620.71 : x
  2. Step 2: Convert to fraction form
    2,815.35/3,885.40 = 1,620.71/x
  3. Step 3: Cross multiply
    2,815.35x = 3,885.40 × 1,620.71
  4. Step 4: Simplify right side
    2,815.35x = 6,297,087.21
  5. Step 5: Solve for x
    x = 6,297,087.21/2,815.35
  6. Step 6: Final answer
    x = 2,236.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.